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In which one of the following is nitrogen not a constituent?

1. Pepsin
2. Idiolbast
3. Bacteriochlorophyll
4. Invertase

Correct answer: Idiolbast

Solution

Pepsin and invertase are proteins, so they contain nitrogen. Bacteriochlorophyll is a chlorophyll pigment with nitrogen in its ring structure, whereas Idiolbast is not a nitrogen-containing biochemical constituent.

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